کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1401947 | 984727 | 2013 | 10 صفحه PDF | دانلود رایگان |
• Copolymerisation of TMC and ε-CL was catalysed by methanesulfonic acid.
• Mono and bifunctional alcohols were used as initiators.
• Monodisperse distribution were observed with bifunctional initiators.
• Random copolymers of TMC and ε-CL were produced.
The copolymerisation of ε-caprolactone (ε-CL) and trimethylene carbonate (TMC) catalysed by methanesulfonic acid was investigated. Preliminary copolymerisation tests using a monofunctional initiator confirm that the side bidirectional propagation previously detected in the homopolymerisation of TMC is also present in the copolymerisation. The comonomers in the ε-CL/TMC system do not follow first order kinetics. The values of the reactivity ratios obtained by the Kellen–Tüdös method (rε-CL = 2.90; rTMC = 0.62) suggest that random copolymerisation can be achieved, although the copolymer will be richer in ε-CL. Dihydroxyl-telechelic ε-CL/ TMC random copolymers were prepared using a bifunctional initiator. 1H and 13C NMR, SEC and DSC measurements show that the poly(TMC-co-ε-CL) samples presented the expected microstructural characteristics, a unimodal molar-mass distribution and a very narrow polydispersity. Based on these features a novel route for the preparation of block copolyesters with tuned properties, and highly regarded in the development of materials for biomedicine, may be foreseen.
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Journal: European Polymer Journal - Volume 49, Issue 12, December 2013, Pages 4025–4034